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? ??? ?? PHP ???? PHP5?? ??? ??? ??? ???? ??? ??????

PHP5?? ??? ??? ??? ???? ??? ??????

Dec 13, 2024 am 03:08 AM

How to Implement the Singleton Design Pattern in PHP5?

PHP5? ??? ??? ??

PHP5?? ??? ??? ??? ????? ??? ???? ??? ????? ?? ? ?? ???? ???? ???. ?? ? ??????????. ?? ?? ??? ???? ?? ????? ???? ?? ?? ????? ?????? ?????.

??? PHP5?? ??? ???? ???? ??? ?? ????.

final class UserFactory
{
    private static $inst = null;

    // Prevent cloning and de-serializing
    private function __clone(){}
    private function __wakeup(){}

    /**
     * Call this method to get singleton
     *
     * @return UserFactory
     */
    public static function Instance()
    {
        if self::$inst === null) {
            self::$inst = new UserFactory();
        }
        return self::$inst;
    }

    /**
     * Private ctor so nobody else can instantiate it
     *
     */
    private function __construct()
    {

    }
}

??? ????? ?? ?? $inst? ???? UserFactory ???? ?? ????? ?????. Instance() ???? ??? getter ??? ???. $inst? null?? ? ????? ???? $inst? ?????.

? ??? ???? ????? Instance() ???? ???? ?? ????? ????.

$fact = UserFactory::Instance();
$fact2 = UserFactory::Instance();

$fact? $fact2? ???? true? ???? ??? ?????? ??? ? ????.

??? ? ????? ???????? ?? new UserFactory()? ?? ???? UserFactory ??? ???? ???? ????? ??? ?????. UserFactory ???? ????? ?? ??? ??? Instance() ???? ???? ????.

? ??? PHP5?? ??? ??? ??? ???? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!

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